src/cmd/nncp-daemon/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2021 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 // NNCP TCP daemon.
  19 package main
  20
  21 import (
  22         "flag"
  23         "fmt"
  24         "log"
  25         "net"
  26         "os"
  27         "strconv"
  28         "strings"
  29         "time"
  30
  31         "github.com/dustin/go-humanize"
  32         "go.cypherpunks.ru/nncp/v7"
  33         "golang.org/x/net/netutil"
  34 )
  35
  36 func usage() {
  37         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  38         fmt.Fprintf(os.Stderr, "nncp-daemon -- TCP daemon\n\n")
  39         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
  40         flag.PrintDefaults()
  41 }
  42
  43 type InetdConn struct {
  44         r *os.File
  45         w *os.File
  46 }
  47
  48 func (c InetdConn) Read(p []byte) (n int, err error) {
  49         return c.r.Read(p)
  50 }
  51
  52 func (c InetdConn) Write(p []byte) (n int, err error) {
  53         return c.w.Write(p)
  54 }
  55
  56 func (c InetdConn) SetReadDeadline(t time.Time) error {
  57         return c.r.SetReadDeadline(t)
  58 }
  59
  60 func (c InetdConn) SetWriteDeadline(t time.Time) error {
  61         return c.w.SetWriteDeadline(t)
  62 }
  63
  64 func (c InetdConn) Close() error {
  65         if err := c.r.Close(); err != nil {
  66                 c.w.Close() // #nosec G104
  67                 return err
  68         }
  69         return c.w.Close()
  70 }
  71
  72 func performSP(
  73         ctx *nncp.Ctx,
  74         conn nncp.ConnDeadlined,
  75         addr string,
  76         nice uint8,
  77         noCK bool,
  78         nodeIdC chan *nncp.NodeId,
  79 ) {
  80         state := nncp.SPState{
  81                 Ctx:  ctx,
  82                 Nice: nice,
  83                 NoCK: noCK,
  84         }
  85         if err := state.StartR(conn); err == nil {
  86                 ctx.LogI(
  87                         "call-started",
  88                         nncp.LEs{{K: "Node", V: state.Node.Id}},
  89                         func(les nncp.LEs) string {
  90                                 return fmt.Sprintf("Connection with %s (%s)", state.Node.Name, addr)
  91                         },
  92                 )
  93                 nodeIdC <- state.Node.Id
  94                 state.Wait()
  95                 ctx.LogI("call-finished", nncp.LEs{
  96                         {K: "Node", V: state.Node.Id},
  97                         {K: "Duration", V: int64(state.Duration.Seconds())},
  98                         {K: "RxBytes", V: state.RxBytes},
  99                         {K: "TxBytes", V: state.TxBytes},
 100                         {K: "RxSpeed", V: state.RxSpeed},
 101                         {K: "TxSpeed", V: state.TxSpeed},
 102                 }, func(les nncp.LEs) string {
 103                         return fmt.Sprintf(
 104                                 "Finished call with %s (%d:%d:%d): %s received (%s/sec), %s transferred (%s/sec)",
 105                                 state.Node.Name,
 106                                 int(state.Duration.Hours()),
 107                                 int(state.Duration.Minutes()),
 108                                 int(state.Duration.Seconds()/60),
 109                                 humanize.IBytes(uint64(state.RxBytes)),
 110                                 humanize.IBytes(uint64(state.RxSpeed)),
 111                                 humanize.IBytes(uint64(state.TxBytes)),
 112                                 humanize.IBytes(uint64(state.TxSpeed)),
 113                         )
 114                 })
 115         } else {
 116                 var nodeId string
 117                 var nodeName string
 118                 if state.Node == nil {
 119                         nodeId = "unknown"
 120                         nodeName = "unknown"
 121                         nodeIdC <- nil
 122                 } else {
 123                         nodeId = state.Node.Id.String()
 124                         nodeName = state.Node.Name
 125                         nodeIdC <- state.Node.Id
 126                 }
 127                 ctx.LogI(
 128                         "call-started",
 129                         nncp.LEs{{K: "Node", V: nodeId}},
 130                         func(les nncp.LEs) string { return "Connected to " + nodeName },
 131                 )
 132         }
 133         close(nodeIdC)
 134 }
 135
 136 func main() {
 137         var (
 138                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 139                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 140                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 141                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
 142                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 143                 noCK      = flag.Bool("nock", false, "Do no checksum checking")
 144                 mcdOnce   = flag.Bool("mcd-once", false, "Send MCDs once and quit")
 145                 spoolPath = flag.String("spool", "", "Override path to spool")
 146                 logPath   = flag.String("log", "", "Override path to logfile")
 147                 quiet     = flag.Bool("quiet", false, "Print only errors")
 148                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 149                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 150                 debug     = flag.Bool("debug", false, "Print debug messages")
 151                 version   = flag.Bool("version", false, "Print version information")
 152                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 153
 154                 autoToss       = flag.Bool("autotoss", false, "Toss after call is finished")
 155                 autoTossDoSeen = flag.Bool("autotoss-seen", false, "Create .seen files during tossing")
 156                 autoTossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 157                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 158                 autoTossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 159                 autoTossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 160         )
 161         log.SetFlags(log.Lshortfile)
 162         flag.Usage = usage
 163         flag.Parse()
 164         if *warranty {
 165                 fmt.Println(nncp.Warranty)
 166                 return
 167         }
 168         if *version {
 169                 fmt.Println(nncp.VersionGet())
 170                 return
 171         }
 172         nice, err := nncp.NicenessParse(*niceRaw)
 173         if err != nil {
 174                 log.Fatalln(err)
 175         }
 176
 177         ctx, err := nncp.CtxFromCmdline(
 178                 *cfgPath,
 179                 *spoolPath,
 180                 *logPath,
 181                 *quiet,
 182                 *showPrgrs,
 183                 *omitPrgrs,
 184                 *debug,
 185         )
 186         if err != nil {
 187                 log.Fatalln("Error during initialization:", err)
 188         }
 189         if ctx.Self == nil {
 190                 log.Fatalln("Config lacks private keys")
 191         }
 192         ctx.Umask()
 193
 194         if *inetd {
 195                 os.Stderr.Close() // #nosec G104
 196                 conn := &InetdConn{os.Stdin, os.Stdout}
 197                 nodeIdC := make(chan *nncp.NodeId)
 198                 go performSP(ctx, conn, "PIPE", nice, *noCK, nodeIdC)
 199                 nodeId := <-nodeIdC
 200                 var autoTossFinish chan struct{}
 201                 var autoTossBadCode chan bool
 202                 if *autoToss && nodeId != nil {
 203                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 204                                 nodeId,
 205                                 nice,
 206                                 *autoTossDoSeen,
 207                                 *autoTossNoFile,
 208                                 *autoTossNoFreq,
 209                                 *autoTossNoExec,
 210                                 *autoTossNoTrns,
 211                         )
 212                 }
 213                 <-nodeIdC // call completion
 214                 if *autoToss {
 215                         close(autoTossFinish)
 216                         <-autoTossBadCode
 217                 }
 218                 conn.Close() // #nosec G104
 219                 return
 220         }
 221
 222         cols := strings.Split(*bind, ":")
 223         port, err := strconv.Atoi(cols[len(cols)-1])
 224         if err != nil {
 225                 log.Fatalln("Can not parse port:", err)
 226         }
 227
 228         if *mcdOnce {
 229                 for ifiName := range ctx.MCDTxIfis {
 230                         if err = ctx.MCDTx(ifiName, port, 0); err != nil {
 231                                 log.Fatalln("Can not do MCD transmission:", err)
 232                         }
 233                 }
 234                 return
 235         }
 236
 237         ln, err := net.Listen("tcp", *bind)
 238         if err != nil {
 239                 log.Fatalln("Can not listen:", err)
 240         }
 241
 242         for ifiName, secs := range ctx.MCDTxIfis {
 243                 if err = ctx.MCDTx(ifiName, port, time.Duration(secs)*time.Second); err != nil {
 244                         log.Fatalln("Can not run MCD transmission:", err)
 245                 }
 246         }
 247
 248         ln = netutil.LimitListener(ln, *maxConn)
 249         for {
 250                 conn, err := ln.Accept()
 251                 if err != nil {
 252                         log.Fatalln("Can not accept connection:", err)
 253                 }
 254                 ctx.LogD(
 255                         "daemon-accepted",
 256                         nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}},
 257                         func(les nncp.LEs) string {
 258                                 return "Accepted connection with " + conn.RemoteAddr().String()
 259                         },
 260                 )
 261                 go func(conn net.Conn) {
 262                         nodeIdC := make(chan *nncp.NodeId)
 263                         go performSP(ctx, conn, conn.RemoteAddr().String(), nice, *noCK, nodeIdC)
 264                         nodeId := <-nodeIdC
 265                         var autoTossFinish chan struct{}
 266                         var autoTossBadCode chan bool
 267                         if *autoToss && nodeId != nil {
 268                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 269                                         nodeId,
 270                                         nice,
 271                                         *autoTossDoSeen,
 272                                         *autoTossNoFile,
 273                                         *autoTossNoFreq,
 274                                         *autoTossNoExec,
 275                                         *autoTossNoTrns,
 276                                 )
 277                         }
 278                         <-nodeIdC // call completion
 279                         if *autoToss {
 280                                 close(autoTossFinish)
 281                                 <-autoTossBadCode
 282                         }
 283                         conn.Close() // #nosec G104
 284                 }(conn)
 285         }
 286 }